* .github: move pull request template into .github directory
This keeps it out of the root directory. The main intention is
that keeping it out-of-root helps give it less attention which
is enough for the template.
* .github: add a issue form template for the app
This is based on the exisitng issue template of the app. It has
some additional tweaks done to update stale information.
* .github: add some more issue templates
For some time now, GitHub is showing cards when we hover over an issue
number which gives us a quick summary of the issue. The issue title is
shown in the card among other things.
Given that and the fact that we already require the issue number to be
specified in the pull request description, it's now moot to
ask the contributors to include the issue title in the pull request
description. So, let's remove this unnecessary burden from them.
* Update ISSUE_TEMPLATE.md
with wiki link and minor formatting changes
* Update PULL_REQUEST_TEMPLATE.md
making the formatting more similar to the issue template, simplifying some language and improving links
